SH7050 Datasheet, PDF (557/841 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer SuperH RISC engine Family/

Section 18 ROM (128 kB Version)
18.2.2 Mode Transitions
When the mode pins and the FWE pin are set in the reset state and a reset-start is executed, the
SH7050 enters one of the operating modes shown in figure 18.2. In user mode, flash memory can
be read but not programmed or erased.
Flash memory can be programmed and erased in boot mode, user program mode, and programmer
mode.
*1
User mode
MD1 = 1,
FWE = 0
RES = 0
Reset state
RES = 0
MD1 = 1,
FWE = 1
RES = 0
*2
FWE = 1 FWE = 0
User
*1
program mode
MD1 = 0, RES = 0
FWE = 1
Programmer
mode
On-board programming mode
Boot mode
Notes: Only make a transition between user mode and user program mode when the CPU is
not accessing the flash memory.
1. RAM emulation possible
2. MD0 = 1, MD1 = 0, MD2 = 1, MD3 = 1
Figure 18.2 Flash Memory Mode Transitions
Rev. 5.00 Jan 06, 2006 page 537 of 818
REJ09B0273-0500